Tandberg Data
Write
30-2
Tandberg SLR Product Line SCSI Functional Specifications
30.2. Command Descriptor Block
BYTE
BIT 7
6
5
4
3
2
1
0
00
Operation Code
0Ah
01
Logical Unit Number (LUN)
RESERVED
FIX
02
Transfer Length
03
04
05
RESERVED
FLAG
LINK
Table 30-1: WRITE Command Descriptor Block
FIX
A Fixed (FIX) bit of zero indicates that a single block
will be transferred with the Transfer Length specifying
the length of the block in bytes. A FIX bit of one
indicates that the Transfer Length specifies the number
of fixed length blocks to be transferred from the
Initiator.
Transfer Length
This field specifies the number of bytes or blocks
requested for transfer. Any value in the range 0..262144
is legal when the FIX bit is set to zero. When the FIX
bit is set to one any value in the range 0..16777215 is
legal.
30.3. Data Compression
The Drive is able to compress the data before it is
written to the medium. The compression capability is
controlled by parameters in the Data Compression Page of
the MODE SELECT command. Compression may here be turned
on or off.
30.4. Write from BOP
Write from BOP is allowed:
when the Write command is the first medium access
command executed on a newly inserted cartridge. If
the partition number is not explicitly changed, the
Drive will start writing on partition zero.
after an ERASE, LOAD (with Load bit set to one) or
REWIND command. Refer to the corresponding command
description for the partition number.
after a SPACE or LOCATE command which terminated with
CHECK CONDITION and Error Code set to B
EGINNING
-
OF
-
PARTITION
/
MEDIUM DETECTED
.
when the tape is logically positioned at BOP after a
successful SPACE or LOCATE command.
